6665021345 has 8 divisors (see below), whose sum is σ = 8129141160. Its totient is φ = 5244606720.

The previous prime is 6665021329. The next prime is 6665021353. The reversal of 6665021345 is 5431205666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 133795489 + 6531225856 = 11567^2 + 80816^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6665021345 - 2⁴ = 6665021329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6665021299 and 6665021308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10925960 + ... + 10926569.

It is an arithmetic number, because the mean of its divisors is an integer number (1016142645).

Almost surely, 2^6665021345 is an apocalyptic number.

It is an amenable number.

6665021345 is a deficient number, since it is larger than the sum of its proper divisors (1464119815).

6665021345 is a wasteful number, since it uses less digits than its factorization.

6665021345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21852595.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 6665021345 is about 81639.5819746770. The cubic root of 6665021345 is about 1881.9172143263.

The spelling of 6665021345 in words is "six billion, six hundred sixty-five million, twenty-one thousand, three hundred forty-five".